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NEET levelSingle correct optionDifficulty 1 of 3ie005

Which of the following species is amphiprotic (can both donate and accept a proton)?

A $HCO X_{3} X^{-}$
B $NH X_{4} X^{+}$
C $Cl X^{-}$
D $SO X_{4} X^{2 -}$

Answer: A

HCO X_{3} X^{-}

can lose a proton to give

CO X_{3} X^{2 -}

and can gain one to give

H X_{2} CO X_{3}

.

NH X_{4} X^{+}

can only donate;

Cl X^{-}

and

SO X_{4} X^{2 -}

can only accept a proton.

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